81160137 has 10 divisors (see below), whose sum is σ = 121239338. Its totient is φ = 54106704.

The previous prime is 81160127. The next prime is 81160147. The reversal of 81160137 is 73106118.

It is an interprime number because it is at equal distance from previous prime (81160127) and next prime (81160147).

It can be written as a sum of positive squares in only one way, i.e., 50424201 + 30735936 = 7101^2 + 5544^2 .

It is not a de Polignac number, because 81160137 - 2¹² = 81156041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81160137.

It is not an unprimeable number, because it can be changed into a prime (81160127) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 500908 + ... + 501069.

Almost surely, 2^81160137 is an apocalyptic number.

It is an amenable number.

81160137 is a deficient number, since it is larger than the sum of its proper divisors (40079201).

81160137 is a wasteful number, since it uses less digits than its factorization.

81160137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001989 (or 1001980 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 81160137 is about 9008.8921072460. The cubic root of 81160137 is about 432.9598161359.

The spelling of 81160137 in words is "eighty-one million, one hundred sixty thousand, one hundred thirty-seven".